JPS5837133A - Pierced groove sintering method - Google Patents

Abstract

PURPOSE:To remarkably increase the quantity of an ore to be charged, and also to elevate its yield and quality, by executing compression of a charging material layer and groove-piercing of the material layer, when converting a powder iron ore to a lump by a sintering machine. CONSTITUTION:A material 13 charged onto a pallel 1 of a DL sintering machine is compressed by a holding plate 14 or a roll, etc., and density of the charged material is raised. Subsequently, in this material layer 13, a groove-piercing jig 16 is fixed and installed by a supporting base 17. In this state, as the layer 13 moves in the direction as indicated with an arrow together with the pallet 1, a thin groove is pierced in the layer 13 the jig 16. The jig 16 is installed at a constant interval in the width direction of the pallet 1, and one row or more are installed in the direction being in parallel with width of the pallet, and its interval, width, thickness, angle, depth, etc. are selected suitably depending on a material to be used and the working condition. In this way, as for a sintered ore 2 on a fire grate 5, a combustion melting zone 3 and an unfired material 4, becomes good in its permeability owing to the thin groove 7, therefore, productivity of the sintered ore can be secured, and an advancing speed of the melting zone 3 can be equalized.

Description

[Detailed Description of the Invention] When agglomerating fine ore in a DL sintering machine, if the density #i of the raw material charged on a pallet is increased.

The bonding situation between fine ore has been improved, improving product yield and yield, and reducing energy consumption per ton of agglomerated ore product by 41%.
It is expected that it will be possible to significantly increase the amount of ore charged. By reducing the essential sintering fM#Ii, it is expected that the energy consumption will be reduced and the reducibility will be improved.

However, in the central sintering process, the productivity of sintered ore decreases to 11 because the sintering raw material layer is sluggish, which impairs the permeability of the raw material layer.

For this reason, in the sintering method actually carried out,
Rather, they strive to ensure productivity by making the charging belt sparse.

This invention company, charging belt! This invention was completed as a result of pursuing a method that takes advantage of the above-mentioned advantages brought about by increasing f and also solves the problem of reduced productivity.

What mainly determines the quality of sintered ore is the behavior of the combustion melt zone in the sintered raw material layer.

The height of the O combustion melting zone is aal, and the thickness of the raw material layer is 40
The thickness is extremely small compared to ~50-. Moreover, in this part of the combustion melting zone, the charge layer IP4 is melted, and the melt is broken through and air is passing through.

Therefore, for the sintering raw material layer other than the combustion melting zone,
Even if the air permeability is improved mechanically by some means, the same result will not occur. Now, if we consider the case where many narrow grooves are drilled in the sintered raw material layer, in the combustion melting zone, the shadow of the narrow grooves w' will be small because the raw material is melted, and in the unburned raw material layer, there will be small grooves. The grooves provide excellent air permeability, and the fine particles are evenly distributed in the sintering raw material layer! ! yields the following profit A.

Generally, in the sintering operation, the advancing speed fFi of the combustion melting zone 3 is not uniform, as shown by 1f'[lt in FIG. 1.

It seems that there is a part of the salt field where the sintering speed is high.

The ventilation resistance in that part becomes smaller, and the traveling speed of the combustion melting zone becomes faster and faster.

This causes uneven firing of the sintered raw material layer.

This may also cause unfired hydrogen and materials to remain and be discharged from the sintering machine.

In FIG. 1, l is a pallet, 2 is a sintered ore, 4 is an unfired raw material, 5 is a fire grate, and 6 is a windex.

However, if the narrow grooves 7 are uniformly distributed in the JR family layer.

Progress speed of combustion melt zone 3! This promotes a tendency to make f uniform as shown in the second column, prevents uneven burning of raw materials, and prevents unfired raw materials from being discharged from the sintering machine.

This, together with the improvement in the quality of the sintered ore products, makes the yield of the sintered ore products even higher.

Based on the above idea #C, we have developed a sintering manufacturing method that allows for a large increase in the amount of ore charged, while at the same time saving energy, improving yield, improving quality, and improving susceptibility to defects. , is the present invention.

As an embodiment of the present invention is shown in FIG. 4, the DL printing l! ! The raw materials 131 charged on one pallet 1 are compressed by presser plates x 4 To-L or rolls 15, etc. to achieve the density of the charged raw materials.

FIG. 3 is a diagram showing the situation before and after the ignition furnace of a conventional sintering facility.

Next, No. 51gK shows an example of a method for punching many fine holes in the compressed raw material layer.

Jms diagram (110@ side view, and 1bl of the same figure shows a plan view.

The groove-drilling jig 16 is preferably one having a thickness of several times less than 1,000 yen, and is fixed and installed in the raw material layer 13 with a support stand 17 . As the raw material layer 13 moves together with the pallet 1 in the direction of the arrow, narrow grooves are bored in the raw material layer by a fixedly installed groove drilling jig 16.

The electrical equipment for the drilling equipment is installed at regular intervals in the direction of the pallet, and is installed in one row or in several rows in the direction parallel to the Atlet width. A large number of groove drilling jigs 16 are fixed at fixed locations by support stands 17, but their spacing, width, thickness, corner threshold, installation depth within the raw material layer, etc. vary depending on the raw materials used and working conditions. However, in order to improve the quality of the entire raw material layer and improve productivity, the installation depth of the perforation tool #5 can be selected as appropriate.
c200- or more, preferably 300- or more, most preferably the jig tip is at the bottom of the pallet KI! 4. In carrying out the method of the present invention, the degree of compression, the width of the narrow grooves, the number of narrow grooves,
By changing the width of the narrow grooves, the directional spacing of the narrow grooves, etc.
The effects are also different.

The effect differs slightly depending on whether the first thin hole is drilled before the compression of the raw material layer, or whether the first thin hole is drilled after the raw material layer is compressed.

However, in any case, energy saving, yield improvement,
Since the effects of improving quality, reducibility, and productivity can be obtained, the working method may be changed as appropriate depending on the characteristics of the sintering machine to be applied, the properties of the raw materials, needs, etc.

Also, the place to drill the pressure fi1% groove can be either before or after the ignition furnace, and even if the groove and pressure M are carried out at the same time, it will be fine.

An example of the results of implementing the present invention is shown in gt*.

The results shown in Table 1 are as follows: The total thickness of the raw material layer is 1 m with a layer thickness of 53 aw.
Comparing with the conventional sintering method based on the results of @1 table of 50 holes at 30-intervals using a drilling jig/tube with a large number of thick hard plates in the vertical direction, thin #I of %l-width was made with 50 holes at 30-inch intervals. As a result of sintering using the method of the present invention, productivity was greatly improved, and furthermore, the amount of coke mixed in the raw material could be reduced by 0.1%, and the yield ratio was improved by 5%, so sintering The amount of energy consumed for product production has decreased by approximately 8%.

The drop strength has been improved by f%, and the reduction property has also been improved.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view showing the state of the combustion melt zone in the conventional sintering method. FIG. 2 is a cross-sectional view showing the state of the combustion melt zone in the sintering method according to the present invention. FIG. 3 is a diagram showing the state of failure at the front of the ignition furnace of conventional sintering equipment. Figure 4 tel, lb) is a diagram showing an example of the sintered raw material layer compression method in the sintering method according to the present invention, ta+ is the compression method of the sintered raw material layer using a holding plate, and s lt+) is the sintering method using rolls. This is field 411fB, which is a crystallizing material layer. FIG. 5 is a diagram showing an example of a method for boring thin grooves in the sintering raw material layer in the sintering method according to the present invention. 1...Pallet, 2...Sintered ore, 3.
...Burning molten zone, 4...Unfired raw @, 5
・・・・・・Grate, 6・・・Wind Zetsutas, 7−・−・Small groove, 8・・・−Bedding hotsuba−19−・−
[a Hopper% 10...Roll feeder,
11... Ignition furnace, 12... Heat retention furnace, 1
3... Sintering raw material layer, 14... Pressing plate,
15--Compression tool, 16--Drilling jig, 17--Drilling jig support. Agent Masamitsu Akizawa 2 people

Claims (1)

[Claims] (11 Using a sintering machine to agglomerate powdered iron ore, a plug is used to compress the raw material layer in the charging layer, and a plug is added to the raw material layer by drilling a large number of fine holes into the raw material layer. Groove sintering method with t%.